/* 视觉方向：冷蓝灰山峦 + 暖橙日落。
   结构色（蓝灰）承担版面，日落橙只用于「下载 / 已验证」这类需要行动或信任的信号。 */
:root {
  --sky: #eef2f6;
  --sky-deep: #e2eaf1;
  --surface: #ffffff;
  --ink: #16283c;
  --ink-soft: #3a4d61;
  --muted: #5d7186;
  --line: #d3dde6;
  --line-strong: #b3c2d0;

  --ridge-1: #c6d3de;
  --ridge-2: #93a8bb;
  --ridge-3: #55697e;
  --ridge-4: #2f4358;
  --ridge-5: #14243a;

  --sun: #b95414;
  --sun-deep: #9b430a;
  --sun-glow: #f0a95c;
  --sun-soft: #fdf1e5;

  --ok: #1f6f56;
  --ok-soft: #e6f1ec;
  --warn: #a4550f;
  --warn-soft: #fbf1e2;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 1px rgba(22, 40, 60, 0.04), 0 10px 26px rgba(22, 40, 60, 0.07);
  --shadow-lift: 0 2px 3px rgba(22, 40, 60, 0.06), 0 16px 38px rgba(22, 40, 60, 0.12);

  --font-display: "Palatino Linotype", "Book Antiqua", Palatino, Georgia,
    "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", STSong, SimSun, serif;
  --font-body: "Avenir Next", "Segoe UI Variable Text", "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", SFMono-Regular, Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--sky);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ridge-4); text-decoration: none; }
a:hover { color: var(--sun-deep); text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, label:focus-visible {
  outline: 3px solid rgba(185, 84, 20, 0.45);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.28;
  margin: 0 0 0.55em;
  font-weight: 700;
  color: var(--ridge-5);
  letter-spacing: 0.002em;
}
h1 { font-size: clamp(2.05rem, 6.4vw, 3.4rem); letter-spacing: -0.015em; }
h2 { font-size: clamp(1.35rem, 3.4vw, 1.8rem); }
h3 { font-size: clamp(1.1rem, 2.4vw, 1.32rem); }
h4 { font-size: clamp(1rem, 2vw, 1.12rem); }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.45em; }
li { margin: 0.4em 0; }
strong { color: var(--ridge-5); }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 18px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--sun); color: #fff; padding: 10px 16px; z-index: 20; font-weight: 700;
}
.skip-link:focus { left: 8px; top: 8px; }

/* 顶栏：山影深蓝底，底部一条日照暖线 */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--ridge-5);
  color: #dbe5ee;
  border-bottom: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--ridge-4) 0%, var(--ridge-2) 32%, var(--sun-glow) 68%, var(--sun) 100%) 1;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 62px; gap: 12px; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; color: #f4f8fb; font-size: 1.24rem;
  letter-spacing: 0.01em;
}
.brand:hover { color: #fff; text-decoration: none; }
.brand-mark {
  width: 14px; height: 14px; border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, var(--sun-glow), var(--sun) 72%);
  box-shadow: 0 0 0 4px rgba(185, 84, 20, 0.22);
}
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-button {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 11px; cursor: pointer; border-radius: var(--radius-sm);
}
.nav-button span { display: block; height: 2px; background: #dbe5ee; border-radius: 2px; }
.site-nav {
  display: none; width: 100%; flex-direction: column; gap: 2px;
  padding-bottom: 12px; border-top: 1px solid rgba(210, 224, 236, 0.22);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a {
  color: #b9c8d6; padding: 12px 4px; min-height: 44px;
  display: flex; align-items: center; font-weight: 600; font-size: 0.98rem;
}
.site-nav a:hover { color: #fff; text-decoration: none; }
.site-nav a.active { color: var(--sun-glow); }

main { padding: 22px 0 44px; }

/* 首页开场：日落山峦带。背景板必须有内缩留白，文字不贴边 */
.hero {
  --hero-pad-x: 20px;
  --hero-pad-top: 34px;
  position: relative;
  padding: var(--hero-pad-top) var(--hero-pad-x) 0;
  background: linear-gradient(180deg, #f7fafc 0%, var(--sky) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.hero-kicker {
  margin: 0 0 12px;
  font-size: 0.82rem; font-weight: 700; letter-spacing: 0.22em;
  color: var(--ridge-3);
}
.hero .lede {
  font-family: var(--font-display);
  font-size: clamp(1.06rem, 2.5vw, 1.32rem);
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0 0 6px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 4px; }
.hero-note {
  margin: 16px 0 0; font-size: 0.9rem; color: var(--muted); max-width: 62ch;
  padding-left: 14px; border-left: 2px solid var(--ridge-1);
}
.hero-ridge { display: block; margin: 28px calc(-1 * var(--hero-pad-x)) 0; line-height: 0; }
.hero-ridge svg { display: block; width: 100%; height: clamp(92px, 15vw, 150px); }

.page-lead { font-size: clamp(1.02rem, 2.2vw, 1.16rem); color: var(--ink-soft); max-width: 64ch; }
.page-meta { color: var(--ridge-3); font-size: 0.85rem; margin: -0.2em 0 0; }
.section-foot { margin: 16px 0 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 11px 20px; border-radius: var(--radius-sm);
  font-weight: 700; font-size: 1rem; font-family: var(--font-body);
  border: 1px solid transparent; transition: transform 0.3s, background-color 0.3s, border-color 0.3s;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--sun); color: #fff; box-shadow: 0 6px 16px rgba(185, 84, 20, 0.24); }
.btn-primary:hover { background: var(--sun-deep); color: #fff; transform: translateY(-2px); }
.btn-secondary { background: var(--surface); color: var(--ridge-4); border-color: var(--ridge-2); }
.btn-secondary:hover { border-color: var(--ridge-4); color: var(--ridge-5); transform: translateY(-2px); }
.btn-ghost { background: var(--surface); color: var(--ink-soft); border-color: var(--line-strong); }
.btn-disabled {
  background: var(--sky-deep); color: var(--muted); border-color: var(--line); cursor: not-allowed;
}

.crumbs { margin: 2px 0 16px; font-size: 0.88rem; color: var(--ridge-3); }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.crumbs li { display: flex; gap: 6px; margin: 0; }
.crumbs li:not(:last-child)::after { content: "›"; color: var(--ridge-2); }

.grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.grid-group { margin-top: 24px; }
.grid-group:first-child { margin-top: 0; }
.grid-title { font-size: clamp(1.12rem, 2.4vw, 1.34rem); margin-bottom: 12px; }

/* 白色信息卡 */
.card {
  position: relative;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px 16px; box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
/* 整块可点：标题链接的 ::after 铺满卡片（零 JS 的 stretched-link），底部行抬回上层保持独立可点 */
.card h3 a::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); border-color: var(--ridge-2); }
.card h3 { margin-bottom: 2px; }
.card h3 a { color: var(--ridge-5); }
.card h3 a:hover, .card:hover h3 a { color: var(--sun-deep); text-decoration: none; }
.card p { margin: 0 0 8px; color: var(--ink-soft); }
.card .icon { width: 28px; height: 28px; color: var(--ridge-3); margin-bottom: 10px; }
.card .icon.alt { color: var(--sun); }
.card-meta {
  font-size: 0.8rem; color: var(--muted); margin-bottom: 10px !important;
  letter-spacing: 0.04em;
}
.card-foot { margin: 0 !important; padding-top: 6px; border-top: 1px solid var(--sky-deep); }
/* 底部那行文字本身抬到覆盖层之上（点它是同一个链接，行为一致）；行内其余空白仍归整卡覆盖层 */
.card-foot .more { position: relative; z-index: 1; }
.more { font-weight: 700; font-size: 0.92rem; color: var(--sun-deep); }
.more:hover { color: var(--sun); }

/* 答案块：日落底 + 暖橙左线 */
.answer {
  margin: 18px 0 22px; padding: 16px 18px;
  background: var(--sun-soft); border: 1px solid #f0d8bd; border-left: 4px solid var(--sun);
  border-radius: var(--radius-sm);
}
.answer-label {
  margin: 0 0 6px; font-size: 0.76rem; font-weight: 700; letter-spacing: 0.2em;
  color: var(--sun-deep);
}
.answer-text { margin: 0; color: var(--ink); font-size: 1.02rem; }

.panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 20px; margin-top: 18px; box-shadow: var(--shadow);
}
.panel > h2 { margin-top: 0; padding-bottom: 10px; border-bottom: 1px solid var(--sky-deep); }
.panel > h2::before {
  content: ""; display: block; width: 34px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--sun) 0%, var(--sun-glow) 100%);
  margin-bottom: 10px;
}
.panel:last-of-type { margin-bottom: 0; }
.panel > p { color: var(--ink-soft); }

.keytable { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.keytable caption {
  text-align: left; color: var(--muted); font-size: 0.8rem; letter-spacing: 0.14em; margin-bottom: 10px;
}
.keytable th, .keytable td { padding: 10px 0; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.keytable th { width: 6.5em; color: var(--muted); font-weight: 600; font-size: 0.9rem; }
.keytable td { color: var(--ink); }
.keytable tr:last-child th, .keytable tr:last-child td { border-bottom: 0; }

.chip {
  display: inline-block; padding: 4px 11px; border-radius: 999px;
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.02em;
}
.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.warn { background: var(--warn-soft); color: var(--warn); }
.chip.ghost { background: var(--sky-deep); color: var(--ridge-3); font-weight: 600; }

.link-list, .pitfalls { list-style: none; margin: 12px 0; padding: 0; }
.link-list li { padding: 12px 0; border-bottom: 1px solid var(--sky-deep); }
.link-list li:last-child { border-bottom: 0; }
.link-url {
  display: block; margin-top: 8px; font-size: 0.82rem; color: var(--muted);
  word-break: break-all; font-family: var(--font-mono);
}
.dl-group + .dl-group { margin-top: 18px; }
.dl-row-label { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; color: var(--ridge-3); margin: 0 0 8px; }
.dl-row { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.dl-item { display: flex; flex-wrap: wrap; align-content: flex-start; gap: 8px; }
.dl-item .btn { width: 100%; }
.dl-item .link-url, .dl-item .pan-state, .dl-item .pan-note { flex-basis: 100%; }
.dl-item .link-url { margin-top: 0; }
.pan-state { font-size: 0.82rem; color: var(--muted); }
.pan-note { margin: 0; font-size: 0.88rem; color: var(--muted); }
.code { font-family: var(--font-mono); font-size: 0.86rem; color: var(--sun-deep); background: var(--sun-soft); padding: 3px 9px; border-radius: 5px; }

.steps { padding-left: 1.5em; }
.steps li { margin: 0.7em 0; color: var(--ink-soft); }
.steps li::marker { font-family: var(--font-display); font-weight: 700; color: var(--sun); }
.pitfalls li { position: relative; padding-left: 1.1em; color: var(--ink-soft); }
.pitfalls li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 6px; height: 6px; border-radius: 50%; background: var(--warn); }

.note {
  font-size: 0.9rem; color: var(--ink-soft); background: var(--sky);
  border: 1px solid var(--line); border-left: 3px solid var(--ridge-2);
  border-radius: var(--radius-sm); padding: 12px 14px;
}

.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 0; }
.faq-item summary {
  cursor: pointer; padding: 14px 4px 14px 0; min-height: 44px;
  list-style: none; color: var(--ridge-5);
  font-family: var(--font-display); font-weight: 700; font-size: 1.04rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "+"; display: inline-block; width: 1.2em; color: var(--sun); font-weight: 700; }
.faq-item[open] summary::before { content: "–"; }
.faq-item[open] summary { color: var(--sun-deep); }
.faq-answer { padding: 0 0 16px 1.25em; color: var(--ink-soft); }
.faq-answer p { margin: 0; }

.prose {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 20px; margin-top: 18px; box-shadow: var(--shadow);
}
.prose h2 { margin-top: 2em; }
.prose h2:first-child { margin-top: 0; }
.prose h3, .prose h4 { margin-top: 1.5em; color: var(--ridge-4); }
.prose p, .prose li { color: var(--ink); }
.prose code { background: var(--sky-deep); padding: 2px 6px; border-radius: 5px; font-size: 0.9em; font-family: var(--font-mono); }
.prose a { font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
.prose blockquote {
  margin: 0 0 1em; padding: 2px 0 2px 16px; border-left: 3px solid var(--ridge-2);
  color: var(--ink-soft); font-family: var(--font-display); font-size: 1.05rem;
}
pre.code {
  background: var(--ridge-5); color: #dbe5ee; padding: 16px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: 0.86rem; line-height: 1.65; font-family: var(--font-mono);
}
pre.code code { background: none; padding: 0; color: inherit; }

/* 列表页视图切换与分页：纯链接，无脚本；控件文字统一压到 0.82rem，触控目标仍 ≥ 42px */
.viewbar { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.view {
  display: inline-flex; align-items: center; min-height: 42px; padding: 6px 15px;
  border: 1px solid var(--line-strong); border-radius: 999px; background: var(--surface);
  color: var(--ink-soft); font-size: 0.82rem; font-weight: 600; letter-spacing: 0.02em;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}
a.view:hover { border-color: var(--ridge-3); color: var(--ridge-5); text-decoration: none; }
.view.is-current { background: var(--ridge-4); border-color: var(--ridge-4); color: #f2f6fa; }

.pager-meta { margin: 20px 0 10px; color: var(--ridge-3); font-size: 0.85rem; }
.pager { display: flex; flex-wrap: wrap; gap: 8px; }
.pager-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 42px; min-height: 42px; padding: 6px 13px;
  border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: var(--surface);
  color: var(--ink-soft); font-size: 0.85rem; font-weight: 600;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}
a.pager-btn:hover { border-color: var(--ridge-3); background: var(--sky-deep); color: var(--ridge-5); text-decoration: none; }
.pager-btn.is-current { background: var(--ridge-4); border-color: var(--ridge-4); color: #f2f6fa; }

/* 详情页顶部的分类 / 标签：结构色胶囊，不用行动色 */
.tags { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 14px 0 4px; }
.tags-label {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.14em; color: var(--ink-soft);
}
.tag {
  display: inline-flex; align-items: center; min-height: 28px; padding: 1px 11px;
  border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
  color: var(--ridge-3); font-size: 0.78rem; font-weight: 600;
}

/* 页脚：暮色山影，与顶栏呼应 */
.site-footer {
  background: var(--ridge-5); color: #b9c8d6; padding: 30px 0 40px; margin-top: 40px;
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--sun) 0%, var(--sun-glow) 34%, var(--ridge-2) 72%, var(--ridge-4) 100%) 1;
}
.foot-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.foot-title {
  font-family: var(--font-display); font-weight: 700; color: #f4f8fb; margin-bottom: 8px; font-size: 1.05rem;
}
.site-footer p, .site-footer li { color: #a9bbc9; font-size: 0.9rem; }
.site-footer a { color: var(--sun-glow); }
.site-footer a:hover { color: #fff; }
.foot-links { list-style: none; margin: 0; padding: 0; }
.foot-links li { margin: 6px 0; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .card:hover, .btn:hover { transform: none; }
}

@media (min-width: 768px) {
  .wrap { padding: 0 28px; }
  .grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .header-inner { flex-wrap: nowrap; }
  .nav-button { display: none; }
  .site-nav {
    display: flex; flex-direction: row; width: auto; padding: 0; border: 0; gap: 6px;
  }
  .site-nav a { padding: 8px 13px; }
  .prose { padding: 34px 38px; }
  .panel { padding: 28px 30px; }
  .foot-grid { grid-template-columns: 1.15fr 1fr 1.5fr; gap: 32px; }
  .dl-row.official { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dl-row.pan { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero { --hero-pad-x: 32px; --hero-pad-top: 44px; }
}

@media (min-width: 1024px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
  .hero { --hero-pad-x: 44px; --hero-pad-top: 56px; }
  .hero-kicker { letter-spacing: 0.3em; }
  main { padding: 28px 0 52px; }
}

@media print {
  .site-header, .site-footer, .viewbar, .pager, .btn, .hero-ridge { display: none; }
  body { background: #fff; }
  .panel, .card, .prose { box-shadow: none; }
}